Enhances the DockerConfig design to support more flexible registry
resolution for shared manifests across different environments,
including air-gapped or network-restricted deployments.
Key improvements:
- Refactors manifest_registry_map to support structured entries with
manifest_registry and override fields.
- Implements clear resolution precedence (per-image, per-manifest,
global default) via get_effective_source_registry_name().
- Enables declarative overrides so the same manifest files can be
reused unchanged, while different environments can redirect all
image sources through configuration alone.
- Allows mixing images with explicit source_registry fields alongside
manifest-level defaults in the same YAML manifest.
- Adds targeted unit tests for DockerConfig to validate resolution
behavior and enforce JSON5 schema constraints.
For example, users can share manifests that reference DockerHub, GCR,
or K8s images, and centrally configure all images to be pulled from
an internal mirror registry (e.g., Harbor) without modifying the
manifests themselves.
Change-Id: I9bbd1fe6a23bfa9afada2e4c54399572e1be0ddc
Signed-off-by: Andrew Vaillancourt <andrew.vaillancourt@windriver.com>
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